/Engine/Source/Editor/GraphEditor/Public/SNodePanel.h
Arrange child nodes - allows derived classes to supply non-node children in OnArrangeChildren
virtual void ArrangeChildNodes ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & AllottedGeometry, [FArrangedChildren](API\Runtime\SlateCore\Layout\FArrangedChildren) & ArrangedChildren ) const